Ventilating apparatus for subways.



J. L. WALKER.

VENTILATING APPARATUS FOR SUBWAYS.

APPLICATION FILED APR.26| I9I2.

Patented May 30,1916.

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VENTILATING APPARATUS FOR SUBWAYS.

APPLICATION FlLED 5PR.26. 1912.

1,185,453. Y Patented Ma)Mr 30,1916.

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Prv rn JOHNL. WALKER, OF COAL CITY, ILLINOIS.`

VENTILATING APPARATUS ron. sUBwAYs.

Application filed April 26, 1912.

To all whom t may concern Be it known that I, JOHN L. WALKER, a subject of the King of Great Britain, residing at Coal City, in thevcounty of Grundy and State of Illinois, have invented new and useful Improvements in Ventilating Apparatus for Subways, of which the following is a specification.

This invention .relates to Ventilating apparatus for subways and other tunnels, and it has for its object to provide a simple and effective installation whereby pure air of the proper temperature may be supplied to such subway or tunnel, means being also provided for withdrawing and disposing of the vitiated air.

A further object of the invention is to provide for the exhaust of vitiated air from a tunnel or subway section by forcing in the direction of a central exhaust duct two currents of pure air, the exhaust of said currents being assisted and accelerated by mechanical means.

With these and other ends in view which will readily appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of parts which will be hereinafter fully described and particularly pointed out in the claim.

In the accompanying drawings has been illustrated a simple and preferred form of the invention, it being, however, understood that no limitation is necessarily made to the precise structural details therein exhibited, but that changes, alterations and modifications within the scope of the claim may be resorted to when desired.

In the drawings,-Figure 1 is a longitudinal sectional view taken through a tunnel or subway equipped with the improved Ventilating apparatus. Fig. 2 is a vertical transverse sectional view taken on the line 2-2in Fig. 1. Fig. 3 is a sectional detail view taken on the line 3-3 in Fig. 1. Fig. 4 is a sectional detail view taken on the line 4-4 in Fig. 1.

Corresponding parts in the several gures are denoted by like characters of reference.

A designates a tunnel or subway. Stations B for the introduction of pure air may be located adjacent to the ends of such tun- Specication of Letters Patent.

Patented May 30, 1916. serial No. 693,449.

nel or adjacent to the ends of a section 2 of such tunnel of proper length to be ventilated by the improved device. Each of said stations includes a refrigerating or heating plant 3 having an air inlet 4, cooling or heating apparatus indicated by coils 5, and an air outlet G from which a pipe or duct 7 extends downwardly into the tunnel or subway, said pipe or duct being provided with a terminal elbow 8 lying below the roof of the tunnel and extending in the direction of the portion of the tunnel or tunnel section midway between the ends thereof where the air outlet to be presently described is located. f

The air duct 7 is provided with a chamber or enlargement C constituting a casing in which is located a fan or blower 12 which may be driven by power derived from any suitable source, the movement of the fan being in the direction indicated by an arrow for the purpose of inducing an air current to move through the inlet 4, outlet 6, duct 7 and elbow 8, said air current being thus projected through the elbow into the subway or tunnel. The pure air which is thus forcibly ejected is previously cooled or heated, as may be required, by contact with the coils 5.

Extending through the roof of the tunnel upwardly and opening into the outer air is an outlet duct 14 having an enlargement forming a chamber or casing C in which a fan or blower l5 is mounted for rotation, said fan being driven by power derived from any suitable source in the direction indicated by an arrow, thus setting up an air current in an outward direction through the duct 14 which terminates in the outer atmosphere. The fan 15 has beenshown as being considerably larger and, therefore, of greater capacity than the fan 12, it being likewise requisite or desirable that the outlet duct should be of an area at least equal to the combined areas of the inlet ducts 7 in order that the amount of air introduced through said inlet ducts may be properly disposed of. Constructed within the tunnel or subway adjacent to the lower end of the outlet duct 14 is a deflector 16 having end openings 17 to receive the air currents coming from the ends of the tunnel to 'guide such currents upwardly into the duct 14. This' deflector serves the purpose of avoiding a strong upward direct draft from the bottom of the tunnel upwardly through the duct 14.

The air entering through the inlet 4 will be cooled or heated according to the needs of the season, or it may be in some seasons left at its initial temperature, thus economizing in the operation of the plant. The pure air will be introduced at the ends ofthe tunnel section provided with the Ventilating apparatus and will naturally travel in the direction of the outlet in the roof of the tunnel intermediate the inlets, the movement in this direction being assisted and accelerated by the natural rise in the temperature of the air within the tunnel, the heated air ascending and moving in the direction of the outlet. In this manner a thorough and efficient ventilation may be established at small expense, and the temperature of the interior of the subway or tunnel may be accurately regulated according to the needs of the season and other existing conditions.

Having thus described the invention, what is claimed as new, is

In a tunnel a ventilator comprising an air outlet duct passing through the roof of the tunnel and having intake ends extending longitudinally of the tunnel and located in the immediate proximity of the roof thereof and beyond the opposite sides of the outlet duct, a deflector located in the outlet duct between the intake ends thereof and in alinement with the center of the outlet duct, and

JOHN L. WALKER.

Witnesses:

JOSEPH CLARK, ANDREW WALKER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

